Armchair



FIG. 1 is a front view of the armchair, showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a view thereof, taken from above;

FIG. 5 is a view thereof, taken from below; and,

FIG. 6 is a view thereof, taken from the side opposite to that of FIG. 3. 

The ornamental design for an armchair, as shown and described. 